1201011220091 has 2 divisors, whose sum is σ = 1201011220092. Its totient is φ = 1201011220090.

The previous prime is 1201011220043. The next prime is 1201011220117. The reversal of 1201011220091 is 1900221101021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201011220091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201011220291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600505610045 + 600505610046.

It is an arithmetic number, because the mean of its divisors is an integer number (600505610046).

Almost surely, 2^{1201011220091} is an apocalyptic number.

1201011220091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201011220091 is an equidigital number, since it uses as much as digits as its factorization.

1201011220091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1201011220091 in words is "one trillion, two hundred one billion, eleven million, two hundred twenty thousand, ninety-one".